Ointment containing colloidal compounds.



' loidal metallic UNITED STATES PATENT OFFICE.

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To all whom it may concern Y Be i known that. we, CARL .PAAL, resident of Leipzig, and CONRAD Aunnnenn, resident of Erlangen, Germany, bothcitizens of the German Empire, have invented certain new and useful Improvements in Ointment Containin Colloidal Compounds, of which the following is a specification. I

. In the specification of the German Patent No. 229306, which relates to a process for the production of salves', or ointment preparations, containing inorganic colloids, wool fat or-yolk is incorporated in solutions of metal salts, and these are converted'by the addition of suitable agentslinto oxids", carbonates, basic salts, metals, or freesulfur, and the resulting by-products are removed from the mass. In Example -5 of the said specification the conversion of palladious chlorid into the hydroxid is describedfby the action of sodium hydroxid, which is then converted by reducing agents-into colalladium. If these processes are appli and if caustic alkalis are caused to react on the said saline solutions ground with'wool fat, for the purpose of extracting the therapeutically important hydroxids of the diva lent platinum and alladium, the required quantitative mutua decomposition is not obtained, as in the case of other salts of heavy metals such as silver, mercury, and the like. If an excess of caustic alkali be used, a more or less large part of the resulting, platinum hydroxid will, according to the amount of the excess of the alkali, be converted, as in the case of aluminium, zinc, or lead hydroxid, into an alkali compound in genuine solution, which will become lost in the purification of the product. Consequently this product shows, according to the conditions under which the investigations are carried out, a fluctuating amount of platinum hydroxid. If, on the other hand, only the calculated amount of caustic alkali be employed, the reaction is incomplete. A part of the salt of platinum used remains uncharged, while another part is converted into the corresponding hydroxid of which a small part again combines with Speciflcation or Letters latent. Appfication filed Kay 12, 1913. Serial No. 767,205.

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to the salts of divalent palladium and platinum soluble in;water,

Patented Nov. 4, 1913.

pounds is unavoidable, and a preparation is obtained which again contains a fluctuating amount of hydroxid. Ammonium hydroxid is "equally useless, as with it complex compounds are formed Now we have found, that by using the car- :bonatesof fixed alkalis for the decomposition of the divalent salts of metals of the platinum group 6. g. of platinum and palladium, the corresponding hydroxids can be successfully obtained. This result is surprising, because, according to the conditions of experiments under the aforesaid patent,

valkali carbonates in the presence of wool fat led to the corresponding colloidal carbonates of heavy metals. A hydrolysis therefore takes place in accordance with the following equation Pd(OH),+2NaCl+CO,

. This reaction takes place practically quantitative, because, in the purification of the preparation, no loss of platinum compound ,Occurs and wool fat preparations are obtained, which contain constant roportions of colloidal Pd(OH) or Pt (0 which can be determined in advance when the initial materials used are wei hed quantities of platinum salts and wool Fat.

'Itis known- (see GmeZz'n-Kmut, H andbuch tier Anorgan. Ohemz'e, 1875, vol. 3, p. 1069) that potassium, or sodium, carbonate causes a brown, or black precipitate in the solution of salts of platinum protoxid. This precipitation is not,however, quantitative. The salts of the palladium pro- I toxid behave similarly, the precipitate of Pd(OH) produced by potassium, or sodium, carbonate dissolving wholly, or partly, in the excess of the precipitant (loco ctato, p. 1226). According to the statement of Fischer (100.011., p. 1226) alkali carbonates give a precipitate only whenthey are heated, this precipitate being basic carbonate.

According to the process of the present invention, heat should not be applied, because, under such an application of heat, a separation of wool fat and aqueous liquor at once occurs: further, as hydrated protoxids are to be produced, but no basic carbonates, it would be unlikely that the prior knowledge would lead to the present process, especially as according to the present process, a quantitative decomposition of the divalentplatinum, or palladium, salts by potassium, or' sodium, carbonate takes place, which is an essential condition for obtaining preparations having a predetermined content. The colloidal preparations thus obtained in which the wool fat, or the wool fat alcohols obtained therefrom by saponification, play "the part of the protecting colloid, possess the important property of being absorbed by all the solvents which like ether, petroleum ether, ligroin, liquid paraffin, chloroform, carbon disulfid, fats, ethereal oils, and the like, dissolve wool fat and wool fat alcohols. These preparations are absorbed as organosols' one part of the water used as solvent in the preparation, and one part of the alkali salts produced in the reaction remaining undissolved. After the complete dehydration of these organosols by suitable driers, and on using volatile solvents which can be removed by distillation, pure ointment bodies consisting only of inorganic colloid and. wool fat, or yolk alcohols, can be obtained.

By repeated treatment of the ointment mass with hot water, the by-products resulting during the formation of the inorganic colloids can also be removed. The content of colloidal palladium and platinum compounds in the preparations can be enriched by partially precipitating solutions of the products having a definite content of palladium, or platinum, colloid, for instance the solutions in petroleum ether, obtained during the process by an organic liquid in which wool fat, or wool fat alcohols,'are difiicultly soluble. The surprising result is'then obtained that the corresponding colloidal platinum compounds pass quantitatively into the precipitate with a part of the wool fat, whereby they fully retain their colloidal character, so that the precipitations which present a corresponding higher amount of the corresponding platinum, metal, colloid, likewise possess the valuable property of being absorbed in the form of the liquid organosols, by all organic liquids dissolving wool fat or wool fat alcohols.

The following examples will further illustrate how this invention canbe carried into practice, but the invention is not limited to the said examples.

Example 1-P1'0ductz'0n of a preparation containing 10 per cent. palladium in the form of colloidal palladious hydrowid Pd(0H) .1.7 parts of palladious chlorid (PdCl,=l part. Pd) are heated and dissolved in a mixture of 1 part of fuming hydrochloric acid and 2 parts of water, and the cooled solution is intimately triturated in small portions with 9 parts of yolk softened at a low temperature.

To the ointment mass now colored red-brown by the palladious chlorid, there is added, also in small portions while constantly triturating, a solution of 2 parts of anhydrous sodium carbonate in 4 parts of water. The carbonate converts the palladious chlorid into palladious hydroxid and the liberated carbon dioxid swells up the ointment mass,

which gradually becomes darker. After the i whole of the alkali carbonate has been triturated into the mass, it is allowed to stand a considerable time for the purpose of completing thedecomposition, and the trituration of the mixture is repeated several times. For the purpose of removing thesodium chlorid produced in the reaction and the smallexcess of sodium carbonate, the product may be either treated repeatedly with hot water at from 50 to 60 centigrade,'and the ointment mass dried in cacao at from 40 to 50 centigrade, for the purpose of removing the water; or the original product may be dissolved in from 5 to 6 times its volume of petroleum ether of low boiling point, the greater part of the by-products remainingundissolved and the red-brown liquid organosol being dried with calcium chlorid or dehydrated sodium sulfate. In this case a further part of the by-products separates along with the water. The petroleum ether is then distilled off from the liquid freed from the drying agent and a preparation is thus obtained which shows a content of colloidal palladious hydroxid (:132 per. cent.), corresponding to 10 per cent. palladium. This content of palladious hydroxid can be enriched in the body produced in the manner described, by precipitation from its solution in petroleum ether, a suitable precipitant for this purpose being alcohol.

In order to obtaina preparation of palladious hydroxid directly at such a high percentage, 9 parts of Wool fat are as'hereinbefore described triturated with the afore-- mentioned quantities of palladious chlorid solution and sodium carbonate solution and after complete decomposition the mass softened at a low heat is dissolved in petroleum ether of low boiling point, from 50 to60 parts by volume of ether to 1 part of yolk being used for the purpose. This solution is, as already stated, dried, separated with as little loss as possible of the drying agent by decantation, filtration, and subsequent washing with petroleum ether, the operation being completed by the addition of further petroleum ether to form 100 parts by volume, the resulting solution being then mixed with the same volume of alcohol (100 parts by volume of 96 per cent.) The precipitate of dark-brown flakes and small lumps separatesreadily from the su ernatant yellow solution, which is remove by deca'ntation.

no longer reacts with silver nitrate. The

product thus purified is thereupon freed by pressure from adhering water as far as possible, carefully detached from the filter and dried in vacuo at from 40 to 50 centigrade. The substance can be obtained quite pure and dry it it is again dissolved after drying in vacuo in 50 parts by volume of petroleum ether to 1 part of the original 'wool fat, and allowed to stand for some time with fused calcium chlorid. After distilling oil the solvent from 6 to 7 parts of the ointment body are obtained which now contains from 16 'to 17 percent. of palladium corresponding to from 21 to 22 per cent. of palladious hydroxid, which ointment is absorbed as organosol by all organic li uids dissolving yolk.

roducts of hi h content of colloidal palname hydroxi rectly by the process above described without resorting to fractional precipitation, as for instance a preparation with from 20 per cent. palladium, corresponding to 26.4 per cent. palladious hydroxid, when the initial material consisting of 8 parts of yolk is triturated with a solution of 3.4 parts of PdGl =2 parts Pd in 2 parts of concentrated hydrochloric acid and 4 parts of ,water, in which mass a solution of 4 parts of sodium carbonate in 8 parts of water are stirred, the remainder of the process being carried out as already described.

'Ewample 2--Pr0d'zl0tz'on of a preparation containing 10 per cent. platinum in the form of platinous hydrowidr-As the initial product, platinous chlorid (PtCl in concentratec hydrochloric acid solution is preferably used in which acid solution it exists as readily soluble chloroplatinous acid or sulfite of platinum protoxid may be used, which is obtained by passing gaseous sulfur dioxid through a hot concentrated solution of platinum tetrachlorid PtCL, or through platinic-chlorid hydrochloric acid and subsequent evaporation.

For the preparation'ofan ointment mass containing 10 per cent. of colloidal platinum in the form of platinous hydroxid, an

can also be obtained di-' amount of platinum tetrachlorid (PtCl or platino chlorid hydrochloric acid (:23 parts) corresponding to 1 part of platinum is used as the initial product and the aqueous solution is reduced with sulfur di'oxid evaporated to dryness on the water .bath and the brown hygroscopic mass is dissolved in 3 parts of water. This solution is then triturated intimately in smallportions with9 parts of wool fat softened at a low heat and then the mass is for the purpose of decomposing the platinum salt into platinous hydroxid again triturated in portions with 2.5 parts of anhydrous sodium carbonate,

dissolved in 4.5 parts ofwater. The platinous salt is decomposed into platinous carbonate (PtCO by the sodium carbonate,

which platinous carbonate is spontaneously decomposed in the presence of water into colloidal platinous hydroxid Pt(OI-I) and carbon dioxid. The ointment mass is then I further treated as described in the case of the palladium hydroxid. If it be desired to enrich the platinum content in the wool fat preparation, .We resort to the aforesaid method of precipitation of the petroleum ether solution. If an ointment mass containing 10 per cent. platinum is. theinitial material, a product is obtained by precipitation with alcohol, which contains 24 to "25 per cent. of platinum corresponding to from 28 to 29 per cent. platinous hydroxid, which yields with organic liquids dissolving wool fat, the corresponding organosols.

By using larger amounts of the latinous salt as already stated in the case 0 alladione hydroxid, it is possible to pro uce di- I rectly yolk preparations with larger predetermined percentages of colloidal platinous hydroxid; for example a preparation with 20 per cent. platinum =2-3.5 per cent. of 1 t(OH) may be obtained by parting from 4.6 parts of plat-inic chlorid hydrochloric acid, reducing this by means of sulfur dioxid to the protoxid salt, triturating the salt dissolved in 6 parts of water with 8 parts of yolk, and adding the corresponding amount of concentrated aqueous sodium carbonate (4.5 parts of Na CO 8 .parts H O) the product thus obtained being separated in the manner already described from the by products and water.

Inasmuch as the wool fat acts in the presentprocess as a protecting colloid,- a body preserving the colloidal state of the salts of the metals of the platinum group, other mediums may be employed instead of the wool fat fulfilling the same eflect. Thus for instance, the mixture of the wool fat alcohols obtained from wool fat by saponification can be used in the same manner. The W001 fat alcohols are in their roperties very similar to .the wool fat itself? and the mixture of alcohols obtained therefrom by saponification presents an even greater aflinity for water than wool fat. The wool fat alcohols have a more solid consistency than the wool fat. According as it is desired to obtain preparations of harder or softer quality, the initial material used for the purpose is either a mixture of wool fat alcohols per se or their mixture with wool fat, which last mixture is obtained by melting the components together. The production of the ointment preparations is effected inthe manner already described. The wool fat alcohols are accordingly considered as the equivalent of the wool fat in the process and product of the present invention.

'We claim:

1. Process for the production of prepara tions containing inorganic colloids, consisting in incorporating with a divalent salt of a metal of the platinum group in solution a protecting colloid, adding'a carbonate of an alkali to form the colloidal lower hydroxid of the metal and removing the by-products formed in the process from the resulting preparation.

2. Process for the production of preparations containing inorganic colloids, consisting in incorporating with a divalent salt of a metal of the platinum group in solution a,

protecting colloid, adding a carbonate of an alkali to form the colloidal lower hydroxid of the metal, dissolving the soft mass, mixingthe solution with a liquidsparingly dissolving or not dissolving the protecting colloid and separating the precipitate containing the colloid.

3. Process for the production of preparations containing inorganic colloids, which consists in incorporating with a divalent salt of a metal of the platinum group a profat as a .protectin tecting colloid, converting such metal into the form of a colloidal hydroxidfandremoving the by-products formed in the process fromthe resulting product.

4. Process, for the production of preparations containing inorganic colloids, which consists 1n incorporating with a divalent salt of a metal of the platinum lower hydroxid of the metal, and removing process from the resulting preparation. i

5. As new products, preparations'consist ing'of a colloidal lower hydroxid of a metal of the'platinum tecting colloid.

6. As new'products, preparations consist ing of a colloidal lower hydroxid of a metal oup wool colloid, ad ing a carbonate of an alkai to form the colloidal group together with a proof the platinum group together with wool fat constituents as a protectivecolloid.

7. As new products, preparations consisting of a colloidal lower hydroxid of a metal of the platinum group together with wool fat as'a protective colloid.

8. As new products, preparations consisting of colloidal palladious hydroxid to gether with a protective colloid.

9. As new products, preparations conslsting of colloidal palladious hydroxid to-' gether with wool fat constituents as a protective colloid.

10. As new products, preparations consisting of colloidal palladious hydroxid together with wool fat as a protective colloid.

'In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

CARL PAAL.

I CONRAD AMBEBGER.

,,Witnesses:

' MAX BEESEN,

HERMANN Arrrznmz; 

